How to resolve the algorithm Walk a directory/Recursively step by step in the PureBasic programming language

Published on 12 May 2024 09:40 PM
#Purebasic

How to resolve the algorithm Walk a directory/Recursively step by step in the PureBasic programming language

Table of Contents

Problem Statement

Walk a given directory tree and print files matching a given pattern.

Note: This task is for recursive methods.   These tasks should read an entire directory tree, not a single directory.

Note: Please be careful when running any code examples found here.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Walk a directory/Recursively step by step in the PureBasic programming language

Source code in the purebasic programming language

Procedure.s WalkRecursive(dir,path.s,Pattern.s="\.txt$")
  Static RegularExpression 
  If Not RegularExpression
    RegularExpression=CreateRegularExpression(#PB_Any,Pattern)
  EndIf
  
  While NextDirectoryEntry(dir)
    If DirectoryEntryType(dir)=#PB_DirectoryEntry_Directory
      If DirectoryEntryName(dir)<>"." And DirectoryEntryName(dir)<>".."
        If ExamineDirectory(dir+1,path+DirectoryEntryName(dir),"")
          WalkRecursive(dir+1,path+DirectoryEntryName(dir)+"\",Pattern)
          FinishDirectory(dir+1)
        Else
          Debug "Error in "+path+DirectoryEntryName(dir)
        EndIf
      EndIf
    Else ; e.g. #PB_DirectoryEntry_File 
      If MatchRegularExpression(RegularExpression,DirectoryEntryName(dir))
        Debug DirectoryEntryName(dir)
      EndIf
    EndIf
  Wend
EndProcedure

;- Implementation; Find all .log-files in the C:\Windows tree
ExamineDirectory(1,"C:\WINDOWS\","")
WalkRecursive(1,"C:\WINDOWS\","\.log$")
FinishDirectory(1)

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